macvlan: fix passthru mode race between dev removal and rx path

[ Upstream commit 233c7df0821c4190e2d3f4be0f2ca0ab40a5ed8c, note
  that I had to add list_first_or_null_rcu to rculist.h in order
  to accomodate this fix. ]

Currently, if macvlan in passthru mode is created and data are rxed and
you remove this device, following panic happens:

NULL pointer dereference at 0000000000000198
IP: [<ffffffffa0196058>] macvlan_handle_frame+0x153/0x1f7 [macvlan]

I'm using following script to trigger this:
<script>
while [ 1 ]
do
	ip link add link e1 name macvtap0 type macvtap mode passthru
	ip link set e1 up
	ip link set macvtap0 up
	IFINDEX=`ip link |grep macvtap0 | cut -f 1 -d ':'`
	cat /dev/tap$IFINDEX  >/dev/null &
	ip link del dev macvtap0
done
</script>

I run this script while "ping -f" is running on another machine to send
packets to e1 rx.

Reason of the panic is that list_first_entry() is blindly called in
macvlan_handle_frame() even if the list was empty. vlan is set to
incorrect pointer which leads to the crash.

I'm fixing this by protecting port->vlans list by rcu and by preventing
from getting incorrect pointer in case the list is empty.

Introduced by: commit eb06acdc85585f2 "macvlan: Introduce 'passthru' mode to takeover the underlying device"

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 544ac06..301b39e 100644 (file)
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -204,7 +204,8 @@ static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
        }
 
        if (port->passthru)
-               vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
+               vlan = list_first_or_null_rcu(&port->vlans,
+                                             struct macvlan_dev, list);
        else
                vlan = macvlan_hash_lookup(port, eth->h_dest);
        if (vlan == NULL)
@@ -725,7 +726,7 @@ int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
        if (err < 0)
                goto destroy_port;
 
-       list_add_tail(&vlan->list, &port->vlans);
+       list_add_tail_rcu(&vlan->list, &port->vlans);
        netif_stacked_transfer_operstate(lowerdev, dev);
 
        return 0;
@@ -751,7 +752,7 @@ void macvlan_dellink(struct net_device *dev, struct list_head *head)
 {
        struct macvlan_dev *vlan = netdev_priv(dev);
 
-       list_del(&vlan->list);
+       list_del_rcu(&vlan->list);
        unregister_netdevice_queue(dev, head);
 }
 EXPORT_SYMBOL_GPL(macvlan_dellink);

diff --git a/include/linux/rculist.h b/include/linux/rculist.h
index d079290..6f95e24 100644 (file)
--- a/include/linux/rculist.h
+++ b/include/linux/rculist.h
@@ -241,6 +241,23 @@ static inline void list_splice_init_rcu(struct list_head *list,
 #define list_first_entry_rcu(ptr, type, member) \
        list_entry_rcu((ptr)->next, type, member)
 
+/**
+ * list_first_or_null_rcu - get the first element from a list
+ * @ptr:        the list head to take the element from.
+ * @type:       the type of the struct this is embedded in.
+ * @member:     the name of the list_struct within the struct.
+ *
+ * Note that if the list is empty, it returns NULL.
+ *
+ * This primitive may safely run concurrently with the _rcu list-mutation
+ * primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock().
+ */
+#define list_first_or_null_rcu(ptr, type, member) \
+       ({struct list_head *__ptr = (ptr); \
+         struct list_head __rcu *__next = list_next_rcu(__ptr); \
+         likely(__ptr != __next) ? container_of(__next, type, member) : NULL; \
+       })
+
 /**
  * list_for_each_entry_rcu     -       iterate over rcu list of given type
  * @pos:       the type * to use as a loop cursor.